Hafford honked her horn at a white SUV after getting on Interstate 45, which Harris County assistant Chief Deputy Mark Herman said led to the suspect heckling her.

Hafford's husband told ABC News that his wife works as a customer service representative at Centerpoint Energy and was on her way to work at the time of the shooting.

Courtesy Hadford Family

This undated handout photo shows Kay and Kendrick Hafford.

She was able to pull over and call 911 after the suspect fired one shot at her right window and only realized that she was bleeding while she was talking to the operator.

Herman said that she was in and out of consciousness during the call. While talking to first responders, she was able to give them her husband's contact information and he arrived at the scene before she was transported to a nearby hospital, police said.

KTRK

A woman was shot in a road rage incident in Houston, March 20, 2015.

"She blacked out several times at the scene but she was coherent enough to give investigators some information about the case," Herman added.

There were other calls made to 911 about a driver in a white SUV and now investigators are trying to track the driver, who they believe is a man who was wearing a blue baseball cap. He was last seen going southbound on I-45.

"I'm truly, truly upset. It could have been a lot worse," her husband said, calling her "a tough cookie."